/Engine/Plugins/Runtime/nDisplay/Source/DisplayClusterOperator/Public/IDisplayClusterOperator.h
Register an app with the operator panel
[FDelegateHandle](API\Runtime\Core\Delegates\FDelegateHandle) RegisterApp ( const [FOnGetAppInstance](API\Plugins\DisplayClusterOperator\IDisplayClusterOperator\FOnGetAppInstance) & InGetAppInstanceDelegate )